The Silver Wing is what you need to be able to see Lugia. In between Olivine City and Cianwood City, there are the Whirl Islands. There are four entrances (you need HM07 Whirlpool to reach the islands) but only one of four entrances will lead you to Lugia.
Other than merely having the Silver Wind in your possession/bag, you don't need to do anything else with it.
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You don't 'use' it. You need silver wing to get Lugia. It's located in one of the four islands to the south without Silver Wing in your pack it won't apear. Same with Ho-Oh except with the Rainbow Wing.
You can use a Cyndaquil as a starter Pokemon in heart gold, soul silver, gold, silver, crystal and diamond pearl platinum.
AnswerIf you use Headbutt on a tree in Pokemon Crystal, one of the following Pokemon may appear: SpearowHeracrossAipomEkansHoothootNoctowlSpinarakPinecoLedybaExeggcuteVenonatCaterpieMetapodButterfreeWeedleKakunaBeedrill
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In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.